Import hr-time and user-timing tests, remove redundant webperf copies

Import hr-time and user-timing tests, remove redundant webperf copies

update-w3c-deps import using blink 9d3793ee56e5bb1aa1eef078d848e1b0e6e4d355:

imported csswg-test@3485e567d65f1251d13c1997f95f21e1427c695f
imported web-platform-tests@b287bcffe507dca7cdac72428140ecd862861e41

The tests in http/tests/w3c/webperf were imported from an obsolete
w3c webperf repo. They now live in web-platform-tests and we have
a standard import process for those. Import the ones that do not
rely on http servers, remove redundant copies, and leave a trail
of breadcrumbs in the README.

BUG=498037
R=dpranke@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=197497

[jsbell, 2015-06-18 23:59:41]

dpranke@ - what do you think?

[tkent, 2015-06-19 00:18:06]

tkent@chromium.org changed reviewers:
+ tkent@chromium.org

[tkent, 2015-06-19 00:18:07]

lgtm

[Dirk Pranke, 2015-06-19 00:54:16]

lgtm

[jsbell, 2015-06-19 17:45:06]

The CQ bit was checked by jsbell@chromium.org

[jsbell, 2015-06-19 17:45:06]

The patchset sent to the CQ was uploaded after l-g-t-m from tkent@chromium.org,
dpranke@chromium.org
Link to the patchset: https://codereview.chromium.org/1191043004/#ps20001
(title: "Add idlharness result")

[commit-bot: I haz the power, 2015-06-19 17:45:34]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1191043004/20001

[commit-bot: I haz the power, 2015-06-19 20:33:00]

Committed patchset #2 (id:20001) as
https://src.chromium.org/viewvc/blink?view=rev&revision=197497